<customers>
    <customer id="111">
        <name>Adam</name>
        <age>12</age>
    </customer>
    <customer id="222">
        <name>Eva</name>
        <age>23</age>
    </customer>
    <customer id="333">
        <name>Alex</name>
        <age>123</age>
    </customer>
</customers>